package main.java.lock8;

import java.util.concurrent.TimeUnit;

public class Sync {
    public static void main(String[] args) {
        Phone phone = new Phone();
        new Thread(()->{
            phone.sendMsg();
        },"A").start();

        try {
            TimeUnit.SECONDS.sleep(1);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        new Thread(()->{
            phone.call();
        },"B").start();
    }
}

class Phone{
    //synchronized 锁的对象是方法的调用者
    //两个方法用的是同一个锁，谁先拿到谁执行
    public synchronized void sendMsg(){
        try {
            TimeUnit.SECONDS.sleep(4);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("发短信");
    }

    public synchronized void call(){
        System.out.println("打电话");
    }
}